package com.ebt.m.exception;

import android.app.AlertDialog;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Environment;
import android.util.Log;

import com.ebt.m.AppContext;
import com.ebt.m.utils.ConfigData;

import org.json.JSONException;
import org.json.JSONObject;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;

/**
 * @author Allen.li
 *         <p/>
 *         2014-8-20 上午9:13:46
 */
public class CrashHandler implements UncaughtExceptionHandler {
    public static final String TAG = "CrashHandler";
    // 系统默认的UncaughtException处理类
    private UncaughtExceptionHandler mDefaultHandler;
    // CrashHandler实例
    private static CrashHandler INSTANCE = new CrashHandler();
    // 程序的Context对象
    private Context mContext;
    // 用来存储设备信息和异常信息
    private Map<String, String> infos = new HashMap<String, String>();
    // 用于格式化日期,作为日志文件名的一部分
    private DateFormat formatter = new SimpleDateFormat("yyyy-MM-dd-HH-mm-ss",
            Locale.CHINA);

    private AlertDialog alertDialog;

    /**
     * 保证只有一个CrashHandler实例
     */
    private CrashHandler() {
    }

    /**
     * 获取CrashHandler实例 ,单例模式
     */
    public static CrashHandler getInstance() {
        if (INSTANCE == null) {
            INSTANCE = new CrashHandler();
        }
        return INSTANCE;
    }

    /**
     * 初始化
     *
     * @param context
     */
    public void init(Context context) {
        mContext = context.getApplicationContext();
        // 获取系统默认的UncaughtException处理器
        mDefaultHandler = Thread.getDefaultUncaughtExceptionHandler();
        // 设置该CrashHandler为程序的默认处理器
        Thread.setDefaultUncaughtExceptionHandler(this);
    }

    /**
     * 当UncaughtException发生时会转入该函数来处理
     */
    @Override
    public void uncaughtException(Thread thread, Throwable ex) {
        if (!handleException(ex) && mDefaultHandler != null) {
            // //如果用户没有处理则让系统默认的异常处理器来处理
            mDefaultHandler.uncaughtException(thread, ex);
        } else {
            if (ex != null) {
                handleException(ex);
            }
        }

        String exInfo = "";
        if (ex != null) {
            ex.printStackTrace();
            exInfo = getStackTraceInfo(ex);
            // 保存日志文件
            saveCrashInfo2File(ex, exInfo);
        }
        //获取版本信息
        String desc = "";
        if (infos != null) {
            try {
                JSONObject jo = new JSONObject();
                for (Map.Entry<String, String> entry : infos.entrySet()) {
                    String key = entry.getKey();
                    String value = entry.getValue();
                    jo.put(key, value);
                }
                desc = jo.toString();
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
//		Intent crashedIntent = new Intent(mContext, AlertDialogAcitivity.class);
//		crashedIntent.putExtra("AlertDialogAcitivity",
//				"Unexpected Error occurred.");
//		crashedIntent.putExtra("EXCEPTION_INFO", exInfo);
//		crashedIntent.putExtra("VERSION_INFO", desc);
//		crashedIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
//		crashedIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
//		mContext.startActivity(crashedIntent);
//        AppContext.getInstance().exitApp();
        if(mContext != null) {
            ((AppContext)(mContext.getApplicationContext())).exitApp();
        }
    }

    /**
     * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.
     *
     * @param ex
     * @return true:如果处理了该异常信息;否则返回false.
     */
    private boolean handleException(final Throwable ex) {
        if (ex == null) {
            return false;
        }
        // 使用Toast来显示异常信息
        new Thread() {
            @Override
            public void run() {
                // 收集设备参数信息
                collectDeviceInfo(mContext);
                // // 保存日志文件
                // saveCrashInfo2File(ex);

            }
        }.start();

        return true;
    }

    /**
     * 收集设备参数信息
     *
     * @param ctx
     */
    public void collectDeviceInfo(Context ctx) {
        try {
            PackageManager pm = ctx.getPackageManager();
            PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(),
                    PackageManager.GET_ACTIVITIES);
            if (pi != null) {
                String versionName = pi.versionName == null ? "null"
                        : pi.versionName;
                String versionCode = pi.versionCode + "";
                infos.put("versionName", versionName);
                infos.put("versionCode", versionCode);
            }
        } catch (NameNotFoundException e) {
            Log.e(TAG, "an error occured when collect package info", e);
        }
        Field[] fields = Build.class.getDeclaredFields();
        for (Field field : fields) {
            try {
                field.setAccessible(true);
                infos.put(field.getName(), field.get(null).toString());
            } catch (Exception e) {
                Log.e(TAG, "an error occured when collect crash info", e);
            }
        }
    }

    /**
     * 保存错误信息到文件中
     *
     * @param ex
     * @return 返回文件名称, 便于将文件传送到服务器
     */
    private String saveCrashInfo2File(Throwable ex, String exInfo) {

        StringBuffer sb = new StringBuffer();
        for (Map.Entry<String, String> entry : infos.entrySet()) {
            String key = entry.getKey();
            String value = entry.getValue();
            sb.append(key + "=" + value + "\n");
        }
        sb.append(exInfo);
        // 保存到文件中
        saveExceptionInfoToFile(sb.toString());
        return null;
    }

    private void saveExceptionInfoToFile(String errorInfo) {
        try {
            long timestamp = System.currentTimeMillis();
            String time = formatter.format(new Date());
            String fileName = "crash-" + time + "-" + timestamp + ".log";
            if (Environment.getExternalStorageState().equals(
                    Environment.MEDIA_MOUNTED)) {
                String path = ConfigData.DATA_PATH_CRASH;
                File dir = new File(path);
                if (!dir.exists()) {
                    dir.mkdirs();
                }
                FileOutputStream fos = new FileOutputStream(path + fileName);
                fos.write(errorInfo.getBytes());
                fos.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static String getStackTraceInfo(Throwable ex) {
        Writer writer = new StringWriter();
        PrintWriter printWriter = new PrintWriter(writer);
        ex.printStackTrace(printWriter);
        Throwable cause = ex.getCause();
        while (cause != null) {
            cause.printStackTrace(printWriter);
            cause = cause.getCause();
        }
        printWriter.close();
        String result = writer.toString();
        return result;
    }

}